共查询到20条相似文献，搜索用时 406 毫秒
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以α-甲基苯乙烯和叔戊醇为原料,在催化剂磷酸的作用下合成产物1,1,2,3,3-五甲基茚满。考察了反应温度、催化剂用量、反应物料比对反应收率的影响。结果表明：以10.5g磷酸为催化剂,叔戊醇与α-甲基苯乙烯的摩尔比为1.3：1,反应温度50℃,产物收率达到32%。 相似文献
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Andrew J. Martin 《Sport Management Review》2012,15(1):140-141
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Patricia Vertinsky 《Research quarterly for exercise and sport》2013,84(3):268-272
Abstract This study sought to provide empirical evidence concerning physical education information-seeking patterns of elementary teachers at the primary level. It also investigated the relationship between information use patterns and teachers' attributes. A model based on simple utilitarian concepts explaining information use patterns was developed and tested. The basic assumption of the model was that the use of information sources would increase as the perceived benefits of the information derived increased, and the costs of retrieving and using the information decreased. Subjects for the study were elementary school teachers from the Vancouver school system in British Columbia, Canada (N = 86). Simultaneous equation procedures employing limited information likelihood estimators were used to test the model. The results of the study indicated that sources of information internal to the school system dominated utilization patterns. Among these, curriculum support material and discussion with colleagues were highly favored, suggesting that teachers at these grade levels rely heavily upon the experience of others in the same system and the support of very specific resource materials about physical education activities. The research also showed that those who felt they knew more and claimed to enjoy teaching actively sought to acquire more knowledge from more sources than those who knew less. Finally, the study demonstrated that models based on simple assumptions of rationality can predict decisions concerning information utilization. 相似文献
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Leo Hsu 《Sport, Education and Society》2013,18(1):143-154
The purpose of this study is to resolve ‘moral conflict’ in sport and to present a better approach with respect to right actions for sports participants. While acknowledging that there are many positive values or principles (e.g. Olympism) in sport, some ‘moral conflict’ in sport might still arise and therefore cannot be easily resolved. By introducing Hare's two levels of moral thinking (i.e. intuitive level and critical level), I first clarify the question ‘Why do moral conflicts appear?’ That moral conflicts may arise normally is because people or philosophers tend to think that moral principles ought to be simple and general. In the general situation, it would be fine to follow these kinds of principles when there is no conflicting situation. But in a particular context, there might be a problem. It would be impossible to resolve a conflicting problem if we do not think critically. Second, I suggest that ‘keep the rules’ can be seen as a prima facie principle or duty for sports participants. However, this prima facie principle may not be sufficient or appropriate to resolve the problem of conflict by using the intuitive thinking, since one might face a conflict between ‘keep the rules’ and ‘not to keep the rules’ and s/he cannot select in between. Thus, critical thinking is needed. Third, I try to differentiate critical thinking from intuitive thinking. Critical thinking aims not only to select the best set of prima facie principles for use in intuitive thinking, but also to resolve conflicts between them. So, if we are able to think critically, a prima facie duty sometimes can be overridden by other more important duties (sound and ethical) in a particular situation. However, as not all sports participants are capable enough to think critically, moral education regarding how to develop athletes' ‘critical thinking’ in sport is needed. It may be recommended that virtue ethics play an important role in sport not just through initiating participants into rule‐following but also in cultivating certain dispositions and educating their desires. As it is, what we also need is a good sports education system which can enlighten people toward a better understanding of sport and its values. 相似文献
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